Pro-Grade Cleaner is a complete heavy-duty concrete and masonry cleaner and is designed specifically to clean dirt, grime, food, beverage and oil stains from interlocking concrete paving stones, concrete, brick pavers and clay tile. This easy to use, safe, biodegradable cleaner does not form noxious fumes or damage lawns or flower beds. Pro-Grade Cleaner is concentrated and can be diluted with up to 9 parts water. Its dilution rate with water determines the cleaning power. It is a complete cleaner for any surface that is to be sealed, painted or stained. Pro-Grade Cleaner is also effective as a wood cleaner removing grease and oil stains. When pavers have had efflorescence removed with muriatic acid or GST Efflorescence Remover, Pro-Grade Cleaner should always be used as a neutralizer (pH plus 12), especially if a sealer will be applied.